PARIS (Reuters) - French centrist presidential candidate Emmanuel Macron's party is set to emerge as the largest in June parliamentary elections, according to an OpinionWay-SLPV Analytics poll for Les Echos, the newspaper said on Wednesday.

The poll found Macron's En Marche! (Onwards!) movement on track to win 249 to 286 seats. Centrist and conservative parties would win around 200-210 seats, the far-right National Front would win 15 to 25 seats and the Socialist left 28 to 43 seats.

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The poll -- the first one published on the June 11-18 parliamentary elections -- only included mainland France constituencies and encompassed 535 of the 577 seats in the lower house of parliament.

Macron is favorite to win this Sunday's presidential election runoff but has faced questions about whether he could win a parliamentary majority to enable him to act on his reform proposals.

(Reporting by Adrian Croft; Editing by Ingrid Melander)